The dgRMatrix class is a class of sparse numeric
matrices in the compressed, sparse, row-oriented format. In this
implementation the non-zero elements in the rows are sorted into
increasing column order.
Note: The column-oriented sparse classes, e.g.,
'>dgCMatrix, are preferred and better supported in
the Matrix package.
Objects can be created by calls of the form new("dgRMatrix", ...).
j:Object of class "integer" of length nnzero
(number of non-zero elements). These are the column numbers for
each non-zero element in the matrix.
p:Object of class "integer" of pointers, one
for each row, to the initial (zero-based) index of elements in
the row.
x:Object of class "numeric" - the non-zero
elements of the matrix.
Dim:Object of class "integer" - the dimensions
of the matrix.
signature(from = "matrix", to = "dgRMatrix")
signature(from = "dgRMatrix", to = "matrix")
signature(from = "dgRMatrix", to = "dgTMatrix")
signature(x = "dgRMatrix"): returns the diagonal
of x
signature(x = "dgRMatrix"): returns the dimensions
of x
signature(x = "dgRMatrix"): plots an image of
x using the levelplot function
the '>RsparseMatrix class, the virtual class of all
sparse compressed row-oriented matrices, with its methods.
The '>dgCMatrix class (column compressed
sparse) is really preferred.